PDF malware analysis — malicious · 46fbaef4b9581774

MALICIOUS

PDF

36.5 KB Created: 2020-09-06 15:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f1d1b56b2639cf2f5ba24688f1ef49a1 SHA-1: d8a830558cd6a69d11ea64e143b6984e44368a8d SHA-256: 46fbaef4b95817744f1e774af94dc2eb9aabc928fcc74982d34cf398f5b04356

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. The presence of a large number of embedded links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.me/wix?keyword=bated+breath+horse+form
- https://cdn.shopify.com/s/files/1/0437/5796/1374/files/mufagerokijipofug.pdf
- https://cdn.shopify.com/s/files/1/0437/3217/2965/files/free_printable_periodic_table.pdf
- https://cdn.shopify.com/s/files/1/0433/4324/9563/files/51507443969.pdf
- https://cdn.shopify.com/s/files/1/0434/1373/3534/files/cloudformation_template_add_lambda_trigger.pdf
- https://cdn.shopify.com/s/files/1/0432/8954/2809/files/sogofukos.pdf
- https://cdn.shopify.com/s/files/1/0462/2372/0602/files/32613230214.pdf
- https://cdn.shopify.com/s/files/1/0435/4929/4756/files/71323434755.pdf
- https://cdn.shopify.com/s/files/1/0430/7389/6602/files/powers_of_the_psalms.pdf
- https://cdn.shopify.com/s/files/1/0431/5371/9452/files/sopalexoma.pdf
- https://cdn.shopify.com/s/files/1/0440/5710/0453/files/wibok.pdf
- https://cdn.shopify.com/s/files/1/0439/8402/7806/files/17887496405.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38461358607.pdf
- https://cdn.shopify.com/s/files/1/0433/6880/8613/files/78651527522.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000473a.bin` `25982b46ef911666194d416df54db7a18d4ea427d73d939b49d13d4be6a7bbf6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x473A	5304 bytes
`font_01_sfnt_off00005919.bin` `f3897970d4060d4a33b647923f2fb8b83e23b29f28e26cf9e9e2a65ee47a7414`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5919	14412 bytes

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